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Many sources have been consulted in the preparation of this work.


The following references were the most important:

Armitage, A. M. (2001).

Armitage’s Manual of Annuals, Biennials, and Half-Hardy Perennials. Portland, OR:

Timber Press,Inc. Dirr, M. A. (1998).

Manual of Woody Landscape Plants: Their Identification, Ornamental Characteristics, Culture, Propagation and Uses (Fifth edition).

Champaign, IL: Stipes Publishing, L.L.C.

Hansen, R. & Stahl, F. (1993).

Perennials and Their Garden Habitats (Fourth edition). (Richard Ward Trans.) Cambridge, UK: Cambridge University Press.

Heger, M. & Whitman, J. (1998).

Growing Perennials in Cold Climates.

Lincolnwood (Chicago), IL: NTC/Contemporary Publishing Group, Inc.

Hillier, J. & Coombes, A. (Eds.). (2002).

The Hillier Manual of Trees and Shrubs: Completely updated and revised with 1,500 new plant entries.

Devon, UK: David & Charles.

Hortico, Inc. (2006). Rose Catalogue 2007.

Waterdown, ON: author.International Flower Bulb

L. H. Bailey Hortorium. (1976).

Hortus Third: A Concise Dictionary of Plants Cultivated in the United States and Canada.

New York: Macmillan Publishing Company.

Pickering Nurseries. Roses.

Schreiner’s Iris Gardens. Online Iris Catalogue.

Stokes Seeds, Ltd. (2007). Stokes 2008 Growers Guide. St. Catharines, ON: author.

The Royal Horticultural Society. Horticultural Database.

Valleau, J. M. (1998).

Perennial Gardening Guide:

The Authoritative North American Guide to Over 1500 Varieties of Perennials, Ferns, Grasses and Herbs. Abbotsford, BC: Valleybrook International Ventures, Inc.


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